To answer Question 29, consider the LP problem below. The Old Mill Restaurant is open from 8 a.m. to 10 p.m. daily (14 hours). In addition to the hours the restaurant is open for business, staffers are needed for setup an hour before opening and an hour after closing. The restaurant operates with both full-time and part-time staff on the following shifts: Daily Rate ($) 32 80 Shift 1 2 3 4 5 Worker Part-time Full-time Part-time Full-time Part-time Full-time Part-time Times 7-11 a.m. 7 a.m. - 3 p.m. 11 a.m. - 3 p.m. 11 a.m. - 7 p.m. 3-7 p.m. 3-11 p.m. 7-11 p.m. 32 80 32 6 80 32 7 The following numbers of staff are needed during each of the indicated time blocks. Staff Needed 11 24 16 Times 7 to 11 a.m. 11 a.m. to 1 p.m. 1 to 3 p.m. 3 to 5 p.m. 5 to 7 p.m. 7 to 9 p.m. 9 to 11 p.m. 10 22 17 6 At least one full-time staffer must be available during the hour before opening and after closing. Additionally, at least 30% of the staff should be full-time workers during the restaurant's busy periods from 11 a.m. to 1 p.m. and 5 to 7 p.m. (Decision variables are designated by "X") 29. What is the full-time-staff" constraint expression for the hours between 5 and 7 p.m.? a. X4+ X6 >= 22 b. X4 + X6 >= 220.30) .30( X4 + X6) >= 22 d. X4 + X5 + X6 + X7 >= 22 C